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Describes precisely the intermediate representation used in the C
backend in an ott grammar, and also removes several C-isms where raw C
code was inserted into the IR, so in theory this IR could be
interpreted by a small VM/interpreter or compiled to LLVM bytecode
etc. Currently the I_raw constructor for inserting C code is just used
for inserting GCC attributes, so it can safely be ignored.
Also augment and refactor the instruction type with an aux constructor
so location information can be propagated down to this level.
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